Sir I must disagree with your post. Zenichiro's acts MUST be treated as the act of the city! He was given the aidship to march troops and therefore has the responsibility to use those troops for his city. CITY!
Yes if we are talking about jumpings and such then each person can be judged alone. But this was the act of a city's army marching on a guild. If he acted without approval then the city is still responsible for giving him authority to march troops.
Written by my hand on the 8th of Skyelong, in the year 1016.